Carbureter



J. H. LYTLE AND J. J. -McFARLAND.

CARBURETER.

APPLICATION FILED SEPT. 10| |917.

, I y n UNITED STATESPAIENT OFFICE.

" JoHN H. LYTLE AND JOHN J. MeFARLAND, or MILWAUKEE, WISCONSIN.

CARBURETER.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed September 10, 1917. Serial No. 190,689.

To ZZ whom t may concern.'

Be it known that we, J oHN H. LY'rLE and JoHN J. MGFARLAND, both citizens of the United States, and residents of Milwaukee, in the county of Milwaukee and State of 1Wisconsin, have invented certain new and useful Improvements in Carbureters; and we do hereby declare that the following is a full, clear, and exact description thereof.

The primary object of our invention is to provide a water jacket about the mixing chamber of that type of carbureter in which the heat from the exhaust manifold is utilized to expand the fuel gases. Heretofore it has been found in practice that when the hot gases passing through the manifold come directly in contact with the metal wall of the mixing chamber, said mixing chamber will become overheated and cause preignition of -the gases. Hence our invention is designed to overcome this objection to a type of carbureter which, with the exception mentioned, is a practical and economical device.

It is another object of the present invention to utilize the heat of the exhaust gases of the engine as a means for procuring a desired heating of the explosive mixture and .it is more specifically an object to provide a simple carbureter structure wherein the mixing chamber thereof is disposed in the path of the exhaust gases of the engine.

It is further an object to'provide such a` carbureting device which may be associated with the exhaust and intake manifolds of an engine in a manner according with the general present design of multicylinder engine structures, and may comprise a relatively simple structure.

With the above and other objects and ad'- vantages in view the invention resides more particularly in the novel combination, arrangement andformation of parts* more particularly hereinafter described and more particularly pointed out in the appended p claim.

In the drawings- Figure 1 is an elevational view of the exhaust and intake manifolds of an engine showing the improved carbureter device associated therewith.

Fig. 2 is a sectional view through the carbureter on the line 2-2 of Fig. 1.

Referring now more particularly tothe accompanying drawings, 5 designates the horizontal head portion of the Aexhaust manifold of an engine which includes the central depending portion 6, and 7 designates the intake manifold which is disposed above the exhaust manifold and which in Athe present instance is inwardly offset with respect thereto.

The exhaust manifold above its depending portion 6 is enlarged at 8 in the shape of a bowl and seated in this bowl shaped enlargement is a jacket bowl 9 which is secured in place and held spaced from the walls of the enlargement by an annular flange l0 at its upperportion seated on and secured to a flange 10 at the mouth of the enlargement 8. Seated in the jacket bowl 9 is a mixing chamber bowl 11, spaced therefrom and preferably integrally connected at its mouth with the mouth of the jacket bowl whereby to form anv inclosed water space. Access to this water space is afforded through an opening in the mouth portion ofthe bowl 9 which is normally closed bythe plug 9b to thus seal the Water space. The outer portion of the bowl 11 is provided with a covering wall 12 and the` inner portion of the bowl communicates with a depending portion 13 of the intake manifold.

A well 14 is formed in the cover wall 12 and the lower end of this Well forms a valve Seat engageable by a valve headl which has its stem 16 extending upwardly through the well and carrying an expanslle spring 17 which bears against an adjustable nut 18 on the stem and a s ider 19 secured in the mouth ofthe well. he lower end of the well wall is connected with the adjacent portion of the bowl 9 b an integral tion 20 and formed in this portion an in the adjacent bowl and well wall portions is a fuel duct 21 which at one end communioates with the valve seat and which at its other end communicates with Aa nipple 22 passed through the bowl ortion 8 and threaded in the bowl, 9. his nipple is rovided with an adjusting needle valve 23 to limit flow of fluid therethrough, and is connected with a float valve chamber 24. l

Thus in the operation of the engine, the air and fuel fluid is drawn into the bowl 9 and properly mixed and at the same time heated whereby the vaporization of the lfuel fluid is assured. Inasmuch as the mixing bowl is disposed at the meeting of the flow of exhaust gases, it is at all times subjected to a proper degree of heat. In some instances the degree of heat imparted to the fluid in the mixing bowl would be so great as to causev an explosion of gas in this chamber, and to prevent the possibility of overheating, the wall of the bowl is formed in a hollow manner to provide a water jacket for the mixing chamber.

After the engine has started, it is manifest that the exhaust gases will maintain the desired temperature and, owing to the water jacket, there is no liability of the temperature increasing to such a degree as to cause preignition of the gases within the mixing chamber.

Inasmuch as the average temperature present under `running conditions in the b owl engaging portions of the exhaust gases is not sufficient to' produce a dangerously excessiveheat, no vent is shown for the water space of the jacket, although to meet extreme conditions a pressure valve and feeding means may be employed. It is well known that in the ordinary operation of a motor vehicle, the temperature conditions and the iiow of the exhaust gases varies considerably, and the flow is cut off entirel during those intermittent periods which a ford an opportunity to coast. When the engine is running at Very high speed, or climbing a hill, a high temperature is vpresent and an excessive heat is applied to the bowl. Experience has also demonstrated to us that under coasting conditions the bowl and consequently the mixing chamber may become cooled to such extent as to' prevent vaporization of the fuel and consequently prevent starting the engine when the coasting period is ended without the application of some extraneous heating means or the use of higher grade fuel in the engine. e The function of our water acket is to retain heat during thel coastin or idle periods, as well as to absorb heat uring the high temperature conditions, and thus the water jacket serves to afford a balance in these Variations of temperature conditions, wherein a proper heat will be supplied at all times to the mix- .ing chamber, it being noted that the maximum temperature isnot sulicient to burn out the bowl.

We claim:

The combination with an engine including a horizontally extending intakemanifold and an exhaust manifold disposed below the ex aust manifold and closingthe same, the

depending neck of the intake manifold closi ing the inner portion of the bowl, ya cover for the outer portion of the bowl, a well carried by said cover and forming an air inlet port, and a fuel inlet port adjacent the bottom portion of the well.

In testimony that we claim the fore oing we have hereunto set our hands at Mifwaukee, in the county of Milwaukee and State of Wisconsin. i

'JOHN H. LYTLE. JOHN J. MCFARLAND. 

